{
  "manageEntity": {
    "action": "Save",
    "entityId": "685240",
    "entityType": "Track",
    "nonce": "0x2918d53dbd8ea3274641631aefbb8498ac20e3e87559cd84ae68d7070f5aedfa",
    "signature": "0xb69c0bcb301e1a3eb167299326054e22a26747efffaa0a07ee3472fa1cffafba4aa42fecc0d78d7b236027b63e4bfea25f8677d1fdedcebf3d48364676d275371b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}